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https://github.com/c64scene-ar/llvm-6502.git
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5a70dd1d82
Similar to gep (r230786) and load (r230794) changes.
Similar migration script can be used to update test cases, which
successfully migrated all of LLVM and Polly, but about 4 test cases
needed manually changes in Clang.
(this script will read the contents of stdin and massage it into stdout
- wrap it in the 'apply.sh' script shown in previous commits + xargs to
apply it over a large set of test cases)
import fileinput
import sys
import re
rep = re.compile(r"(getelementptr(?:\s+inbounds)?\s*\()((<\d*\s+x\s+)?([^@]*?)(|\s*addrspace\(\d+\))\s*\*(?(3)>)\s*)(?=$|%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|zeroinitializer|<|\[\[[a-zA-Z]|\{\{)", re.MULTILINE | re.DOTALL)
def conv(match):
line = match.group(1)
line += match.group(4)
line += ", "
line += match.group(2)
return line
line = sys.stdin.read()
off = 0
for match in re.finditer(rep, line):
sys.stdout.write(line[off:match.start()])
sys.stdout.write(conv(match))
off = match.end()
sys.stdout.write(line[off:])
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232184 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
1.2 KiB
LLVM
30 lines
1.2 KiB
LLVM
; RUN: opt < %s -instcombine -S | grep "align 32" | count 1
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; It's tempting to have an instcombine in which the src pointer of a
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; memcpy is aligned up to the alignment of the destination, however
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; there are pitfalls. If the src is an alloca, aligning it beyond what
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; the target's stack pointer is aligned at will require dynamic
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; stack realignment, which can require functions that don't otherwise
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; need a frame pointer to need one.
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;
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; Abstaining from this transform is not the only way to approach this
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; issue. Some late phase could be smart enough to reduce alloca
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; alignments when they are greater than they need to be. Or, codegen
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; could do dynamic alignment for just the one alloca, and leave the
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; main stack pointer at its standard alignment.
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@dst = global [1024 x i8] zeroinitializer, align 32
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define void @foo() nounwind {
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entry:
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%src = alloca [1024 x i8], align 1
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%src1 = getelementptr [1024 x i8], [1024 x i8]* %src, i32 0, i32 0
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([1024 x i8], [1024 x i8]* @dst, i32 0, i32 0), i8* %src1, i32 1024, i32 1, i1 false)
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call void @frob(i8* %src1) nounwind
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ret void
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}
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declare void @frob(i8*)
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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